Used to be great Rated 1 out of 5 stars

Like so many other users, Lighting 1.9 hangs Thunderbird on start up. And to make it more appealing the devs then get all snarky with those that complain...

This review is for a previous version of the add-on (1.9.1). 

Hello angryman. I'm sorry you've had such a bad experience with the developers and Lightning. I'm sorry if I was snarky, although I don't recall any bad experiences.

Fixing such hangs is not an easy task because often its either not reproducable, or the problem lies so deep in Lightning that its not a matter of just a few days to create a patch, but rather a constant process to make gradual improvements.

Be assured, performance is an important issue for me and eventually I will get around to figuring it out.